var OrderPositionsGrid = new Ext.grid.EditorGridPanel({
border: false,
ds: OrderPositionsGridStore,
columns: [ ... ]
[.. more settings ..]
});
How can i change the GroupingStore-URL dynamically on runtime ?
(the OrderID should be taken from a javascript var)

I tried several ways now - the script is executing the right URL - but the results (received data from the script) were not shown in the grid.